Omega Seamaster Cosmic manual wind watch

Omega Seamaster Cosmic manual wind watch with date. Original crystal is in good condition, no big scratches or cracks. Dial is in good condition for its age. Case has traces of age and use and there is an engraving on the back. Original crown is worn and the leather strap is used. Service history is unknown, but the watch works. Date changes and the watch is running approximately +- 1 minute per day.